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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available for sale |  |
Amortized Cost | $ 1,090,363 | $ 822,089
Gross Unrealized Gains | 43,985 | 15,961
Gross Unrealized Losses | (323) | (3,274)
Fair Value | 1,134,025 | 834,776
Held to maturity |  |
Amortized Cost | 168,676 | 207,899
Gross Unrealized Gains | 11,314 | 7,336
Gross Unrealized Losses | 0 | (88)
Fair Value | 179,990 | 215,147
U.S. Treasury and federal agencies |  |
Available for sale |  |
Amortized Cost | 19,750 | 1,415
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (35) | (2)
Fair Value | 19,715 | 1,413
State and municipal |  |
Available for sale |  |
Amortized Cost | 803,100 | 396,931
Gross Unrealized Gains | 35,014 | 11,288
Gross Unrealized Losses | (271) | (2,451)
Fair Value | 837,843 | 405,768
Held to maturity |  |
Amortized Cost | 157,421 | 190,767
Gross Unrealized Gains | 11,035 | 7,129
Gross Unrealized Losses | 0 | (54)
Fair Value | 168,456 | 197,842
Federal agency collateralized mortgage obligations |  |
Available for sale |  |
Amortized Cost | 144,022 | 267,272
Gross Unrealized Gains | 3,448 | 2,543
Gross Unrealized Losses | (17) | (563)
Fair Value | 147,453 | 269,252
Held to maturity |  |
Amortized Cost | 2,661 | 4,560
Gross Unrealized Gains | 36 | 13
Gross Unrealized Losses | 0 | (5)
Fair Value | 2,697 | 4,568
Federal agency mortgage–backed pools |  |
Available for sale |  |
Amortized Cost | 114,484 | 145,623
Gross Unrealized Gains | 4,315 | 1,207
Gross Unrealized Losses | 0 | (258)
Fair Value | 118,799 | 146,572
Held to maturity |  |
Amortized Cost | 8,594 | 12,572
Gross Unrealized Gains | 243 | 194
Gross Unrealized Losses | 0 | (29)
Fair Value | 8,837 | 12,737
Corporate notes |  |
Available for sale |  |
Amortized Cost | 9,007 | 10,848
Gross Unrealized Gains | 1,208 | 923
Gross Unrealized Losses |  | 0
Fair Value | $ 10,215 | $ 11,771

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